Adding disclaimer (#6483)

## What are you changing in this pull request and why?

See
https://dbt-labs.slack.com/archives/C04KKUHLT32/p1731543613086929?thread_ts=1731541457.032289&cid=C04KKUHLT32

## Checklist
- [ ] I have reviewed the [Content style
guide](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/content-style-guide.md)
so my content adheres to these guidelines.
- [ ] The topic I'm writing about is for specific dbt version(s) and I
have versioned it according to the [version a whole
page](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#adding-a-new-version)
and/or [version a block of
content](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#versioning-blocks-of-content)
guidelines.
- [ ] I have added checklist item(s) to this list for anything anything
that needs to happen before this PR is merged, such as "needs technical
review" or "change base branch."
- [ ] The content in this PR requires a dbt release note, so I added one
to the [release notes
page](https://docs.getdbt.com/docs/dbt-versions/dbt-cloud-release-notes).
<!--
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ADDING OR REMOVING PAGES (if so, uncomment):
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<!-- vercel-deployment-preview -->
---
🚀 Deployment available! Here are the direct links to the updated files:


-
https://docs-getdbt-com-git-slack-vpc-dbt-labs.vercel.app/docs/deploy/job-notifications

<!-- end-vercel-deployment-preview -->

---------

Co-authored-by: Mirna Wong <[email protected]>

website/docs/docs/deploy/job-notifications.md

@@ -52,6 +52,8 @@ You can receive email alerts about jobs by configuring the dbt Cloud email notif
 You can receive Slack alerts about jobs by setting up the Slack integration and then configuring the dbt Cloud Slack notification settings. dbt Cloud integrates with Slack via OAuth to ensure secure authentication.
 
 :::note 
+Virtual Private Cloud (VPC) admins must [contact support](mailto:[email protected]) to complete the Slack integration.
+
 If there has been a change in user roles or Slack permissions where you no longer have access to edit a configured Slack channel, please [contact support](mailto:[email protected]) for assistance. 
 :::